Pronunciation: (hē'lē-ō"), [key]
—pl. -li•os. Informal.
1. a heliogram.
2. a heliograph.
a combining form meaning “sun,” used in the formation of compound words: heliolatry. Also, esp. before a vowel,heli-.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.